摘要
[目的]随着我国沿海地区极端天气的日趋频繁,台风灾害给沿海电网造成了极大威胁,为提升架空输电线路抗风能力,目前针对沿海强风区线路通常采取提高设计气象重现期的方法进行设计,《架空输电线路荷载规范》(DL/T 5551—2018)颁布后,由于新、旧规范间风荷载计算方法的差异,此前的抗风加强措施是否与现行规范相适应,成为亟待研究的问题。[方法]以南方电网沿海强风区500 kV重要线路为例,基于输电线路防风可靠度分级体系,通过制定不同的防风设计方案,进而对不同方案下输电线路的抗风能力水平及可靠度进行评估,并对不同设防方案下的技术经济性进行比较,最后结合工程实例,推荐了沿海强风区500 kV重要输电线路的防风设计方案。[结果]在执行荷载规范前提下,按50年重现期基准风速并考虑1.1倍重要性系数(方案三)方案可与此前基于GB50545-2010按100年重现期进行防风设计的抗风举措,无论是在抗风能力以及工程投资上均可良好适配。[结论]对于沿海强风区500 kV重要输电线路,方案三为各设防方案中技术经济指标综合最优的选择,输电线路抗风能力可达16级台风中限,研究对于节约资源、降低碳排放具有重要意义。
[Introduction]With the increasing frequency of extreme weather in China's coastal areas,typhoon disasters pose a great threat to coastal power grids,in order to improve the lines wind protection ability,the design of coastal strong wind area lines usually take to improve the design of the meteorological return period,with the promulgation of the current standards of overhead transmission lines(DL/T 5551-2018),due to the differences in wind load calculation between the new and old codes,the compatibility of the previous wind reinforcement measures with the current code has become an urgent issue to be studied.[Method]This paper took the 500 kV important lines in the coastal strong wind area of the southern power grid as an example,and based on the grading system of wind protection reliability of lines,by formulating different wind protection design schemes,and then evaluating the level of wind resistance and reliability under different schemes,and comparing the technology and economy under different defense schemes,finally,combined with the engineering examples,it recommended the wind protection design scheme for 500 kV important lines in coastal strong wind areas.[Result]Under the premise of implementing the current standards,designing according to the 50-year return period wind speed and considering 1.1 times the importance coefficient(the third option)and the previous design based on GB 50545-2010 according to the 100-year return period,both in the wind resistance and engineering investment can be a good fit.[Conclusion]The third option is the choice of the best combination of technical and economic indicators among the fortification options and the wind-resistant capacity can reach the requirement of the medium limit of 16-stage typhoon,which is of great significance for saving resources and reducing carbon emissions.
作者
颜子威
朱映洁
章东鸿
潘春平
龚有军
YAN Ziwei;ZHU Yingjie;ZHANG Donghong;PAN Chunping;GONG Youjun(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China)
出处
《南方能源建设》
2024年第1期185-195,共11页
Southern Energy Construction
基金
中国能建广东院科技项目“基于阵风效应的线路防风能力设计评估方法与已建维护改造策略研究”(EV04651W)。
关键词
沿海强风区
架空输电线路
可靠度分级
抗风能力
防风设计
coastal strong wind zones
overhead lines
reliability classification
wind resistance
windproof design
